2-11-2
English
Activity:Activity: Operating the Equipment Operating the EquipmentMeasurementMeasurement
Measuring Data Calculator Operation
u Measure the mass of the beaker used for creating the solution.u Perform the following operation to prepare for temperature measurement using the
u Slowly pour the benzene into the beaker so it flows down the inside surface of the beaker.Temperature Measurement Setup.
u Measure the mass of the small amount of naphthalene being used.Using E-CON
u Dissolve the small amount of naphthalene to create a dilute benzene solution, and thenmOE-CON�w1(SETUP)b(Wizard)w
measure the mass of the solution.
u Calculate the molality of the naphthalene.1(CASIO)c(TEMP)b(°C) 5w240w1(YES)
u Divide the dilute benzene solution between two flasks, pouring the solution slowly alongUsing a Calculator Program
the inside surfaces of the flasks.Find the applicable program in the Program Library (P.2-16-3), input it into your calculator,
u Secure one of the flasks in the boiling point elevation system, and the other one in theand then run it.
freezing point depression system.u Display a graph of temperature change starting from the point that the solution is first
heated.
1Benzene
2Naphthalene
3BeakerT(°C):Temperature
4Round Bottom Flaskt(s): Time
5Naphthalene-BenzeneT1(°C):Solution Boiling Point
Solution
u As shown in the illustration, force water through the reflux condenser.
u Display a graph of temperature change starting from the point that the solution is first
cooled.1Reflux Condenser
2Tap
3Water Flow Direction
4Open the tap.T(°C):Temperature
t(s): Time
T2(°C):Solution Freezing Point
u For boiling point elevation, turn on the heater and use the Temperature Measurement
Setup to measure the temperature.555555555555555555555555555555Other Things To Do5555555
u For freezing point depression, turn on the auto stirrer and use the Temperature
Measurement Setup to measure the temperature.u Consider how the molecular weight of naphthalene can be determined using the
u Use the measured changes in temperature to determine boiling point elevation andmeasurement results.
freezing point depression.u Consider why the cooling curve of freezing point depression is not clear.
u Compare the measured results with the results calculated from naphthalene molality.u Create another dilute solution using a different solute, and determine the boiling
point elevation and the freezing point depression.
u Create another dilute solution using a different solvent, and determine the boiling
5555555555555555555555For freezing point depression, use the mixing stick to stir the flask contents.point elevation and the freezing point depression.
20020601 |
ACEC
